971989 has 2 divisors, whose sum is σ = 971990. Its totient is φ = 971988.

The previous prime is 971981. The next prime is 972001. The reversal of 971989 is 989179.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 970225 + 1764 = 985^2 + 42^2 .

It is a cyclic number.

It is not a de Polignac number, because 971989 - 2³ = 971981 is a prime.

It is a super-2 number, since 2×971989² = 1889525232242, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (971981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 485994 + 485995.

It is an arithmetic number, because the mean of its divisors is an integer number (485995).

2⁹⁷¹⁹⁸⁹ is an apocalyptic number.

It is an amenable number.

971989 is a deficient number, since it is larger than the sum of its proper divisors (1).

971989 is an equidigital number, since it uses as much as digits as its factorization.

971989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 40824, while the sum is 43.

The square root of 971989 is about 985.8950248378. The cubic root of 971989 is about 99.0574437905.

The spelling of 971989 in words is "nine hundred seventy-one thousand, nine hundred eighty-nine".